CN102593867B - Solar grid-connected inverter - Google Patents
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Abstract
本发明实施例公开了一种太阳能并网逆变装置，涉及太阳能光伏发电技术领域，解决了现有太阳能并网逆变装置在提升发电量的同时交直流变换模块转换效率低，导致太阳能并网逆变装置转换效率低的问题。本发明实施例提供的具有多个交直流变换模块的太阳能并网逆变装置中，由于其中至少两个模块具有不同的额定功率，使得必然存在一个模块，其额定功率小于P/m，P为装置的额定功率，m为装置中包含的模块个数，从而能在太阳能并网逆变装置轻载时进一步提高太阳能并网逆变装置的转换效率。另外，由于具有较低额定功率的模块的输入电压也较低，使得装置具有较宽的输入电压范围，从而使得装置能早开机，进而进一步提升了发电量。
The embodiment of the invention discloses a solar grid-connected inverter device, which relates to the technical field of solar photovoltaic power generation, and solves the problem that the existing solar grid-connected inverter device has low conversion efficiency of the AC-DC conversion module while increasing power generation, which leads to solar grid-connected The problem of low conversion efficiency of the inverter device. In the solar grid-connected inverter device with multiple AC-DC conversion modules provided by the embodiment of the present invention, since at least two of the modules have different rated powers, there must be a module whose rated power is less than P/m, and P is The rated power of the device, m is the number of modules contained in the device, so that the conversion efficiency of the solar grid-connected inverter device can be further improved when the solar grid-connected inverter device is light-loaded. In addition, since the input voltage of the module with a lower rated power is also lower, the device has a wider input voltage range, so that the device can be started earlier, thereby further increasing the power generation.
Description
技术领域 technical field
本发明涉及太阳能光伏发电技术领域，尤其涉及太阳能并网逆变装置。The invention relates to the technical field of solar photovoltaic power generation, in particular to a solar grid-connected inverter device.
背景技术 Background technique
如图1所示，太阳能并网逆变装置的作用是将光伏阵列发出的直流电逆变成交流电，并馈入电网。太阳能并网逆变装置可包含多个DC/AC(交直流)变换模块，各交直流变换模块具有相同的额定功率，且各交直流变换模块的额定功率之和等于太阳能并网逆变装置的额定功率。任何时刻，太阳能并网逆变装置的输出功率为处于工作状态的各交直流变换模块的输出功率之和。As shown in Figure 1, the function of the solar grid-connected inverter device is to invert the DC power generated by the photovoltaic array into AC power and feed it into the power grid. The solar grid-connected inverter device can include multiple DC/AC (AC-DC) conversion modules, each AC-DC conversion module has the same rated power, and the sum of the rated power of each AC-DC conversion module is equal to the solar grid-connected inverter device rated power. At any moment, the output power of the solar grid-connected inverter device is the sum of the output powers of all the AC-DC conversion modules in the working state.
光伏阵列的输出功率与其接收到的光照强度有关，光照强度越高，电池板的输出电压就越高，输出功率越大。在早晚光照条件较差时，光伏阵列的输出功率较小，同时与其最大功率状态对应的输出电压也较低。The output power of the photovoltaic array is related to the intensity of light it receives. The higher the light intensity, the higher the output voltage of the panel and the greater the output power. When the light conditions are poor in the morning and evening, the output power of the photovoltaic array is small, and the output voltage corresponding to its maximum power state is also low.
通常，交直流变换模块的额定功率越大，其开启电压就越高。包含多个交直流变换模块的太阳能并网逆变装置，相比于只包含一个交直流变换模块的太阳能并网逆变装置，其中交直流变换模块的额定功率较低，因此，在早晚光照条件较差时，即光伏阵列的输出功率较小、输出电压较低时，包含多个交直流变换模块的太阳能并网逆变装置会较早地开机发电，提升了发电量。Generally, the higher the rated power of the AC-DC conversion module, the higher its turn-on voltage. Compared with the solar grid-connected inverter device containing only one AC-DC conversion module, the solar grid-connected inverter device containing multiple AC-DC conversion modules has a lower rated power. Therefore, in the morning and evening light conditions When it is poor, that is, when the output power of the photovoltaic array is small and the output voltage is low, the solar grid-connected inverter device including multiple AC-DC conversion modules will start to generate electricity earlier, increasing the power generation.
交直流变换模块的转换效率(N＝(输入功率/输出功率)*100％)与载荷(L＝(输出功率/额定功率)*100％)之间具有如图2所示的对应关系。从图2中可以看出：交直流变换模块的载荷L＜50％时，转换效率N较低，当载荷L≥50％时，转换效率N达到最大值，载荷L继续增大时，转换效率N缓慢下降，但变化不大。因此，当交直流变换模块工作轻载状态，即输出功率较低的状态，交直流变换模块的转换效率N较低，使得此状态下的太阳能并网逆变装置的功耗较高。There is a corresponding relationship between the conversion efficiency (N=(input power/output power)*100%) of the AC/DC conversion module and the load (L=(output power/rated power)*100%) as shown in FIG. 2 . It can be seen from Figure 2 that when the load L of the AC/DC conversion module is less than 50%, the conversion efficiency N is low; when the load L≥50%, the conversion efficiency N reaches the maximum value; when the load L continues to increase, the conversion efficiency N drops slowly, but not much. Therefore, when the AC-DC conversion module works under a light load state, that is, a state with low output power, the conversion efficiency N of the AC-DC conversion module is low, so that the power consumption of the solar grid-connected inverter device in this state is relatively high.
以太阳能并网逆变装置包含4个交直流变换模块为例，每个模块的额定功率P′＝25％*P，式中的P为装置的额定功率。当装置的载荷W分别为5％、10％、20％、30％、50％、75％、100％时，表1示出了处于工作状态的模块个数m及各模块的载荷Lm(各模块的载荷L表示在模块个数后的括号内)，且满足公式W＝(L1+L2+…+Lm)*25％(m≤4)。Taking a solar grid-connected inverter device including 4 AC/DC conversion modules as an example, the rated power of each module is P′=25%*P, where P is the rated power of the device. When the load W of the device is 5%, 10%, 20%, 30%, 50%, 75%, and 100% respectively, Table 1 shows the number m of modules in working condition and the load L m of each module ( The load L of each module is indicated in the brackets after the number of modules), and satisfies the formula W=(L 1 +L 2 +...+L m )*25% (m≤4).
表1Table 1
从表1中可以看出：当装置的载荷为5％时，只有一个模块处于工作状态，根据上述公式计算：5％＝L1*25％，获得L1＝20％，低于50％，因此，该处于工作状态的模块的转换效率(即整个装置的转换效率)较低。在装置的载荷为10％和20％时，同样存在模块转换效率低的问题。It can be seen from Table 1: when the load of the device is 5%, only one module is in working condition, calculated according to the above formula: 5%=L 1 *25%, obtain L 1 =20%, lower than 50%, Therefore, the conversion efficiency of the module in the working state (that is, the conversion efficiency of the entire device) is relatively low. When the load of the device is 10% and 20%, there is also the problem of low module conversion efficiency.
发明内容 Contents of the invention
本发明的实施例提供一种太阳能并网逆变装置，不仅能保证在光伏阵列的输出电压较低时正常开启，从而能较早地开机发电，进一步提高发电量，而且能提高装置整体的转换效率。Embodiments of the present invention provide a solar grid-connected inverter device, which can not only ensure that the photovoltaic array is normally turned on when the output voltage of the photovoltaic array is low, so that it can start to generate electricity earlier, further increase the power generation, and can improve the overall conversion of the device efficiency.
为达到上述目的，本发明的实施例采用如下技术方案：In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:
一种太阳能并网逆变装置，包括多个交直流变换模块，每个所述交直流变换模块的额定功率之和为所述太阳能并网逆变装置的额定功率，其中，至少两个所述交直流变换模块具有不同的额定功率。A solar grid-connected inverter device, including a plurality of AC-DC conversion modules, the sum of the rated power of each of the AC-DC conversion modules is the rated power of the solar grid-connected inverter device, wherein at least two of the AC-DC conversion modules have different rated power.
本发明实施例提供的太阳能并网逆变装置中，包含多个交直流变换模块，由于其中至少两个模块具有不同的额定功率，使得必然存在一个模块，其额定功率小于P/m，P为装置的额定功率，m为装置中包含的模块个数，从而能在太阳能并网逆变装置轻载时进一步提高交直流变换模块的转换效率，进而进一步提高了太阳能并网逆变装置整体的转换效率。The solar grid-connected inverter device provided by the embodiment of the present invention includes multiple AC-DC conversion modules. Since at least two of the modules have different rated powers, there must be a module whose rated power is less than P/m, and P is The rated power of the device, m is the number of modules contained in the device, so that the conversion efficiency of the AC-DC conversion module can be further improved when the solar grid-connected inverter device is light-loaded, and the overall conversion of the solar grid-connected inverter device can be further improved. efficiency.
此外，由于具有较低额定功率的交直流变换模块的输入电压较低，使得一部分交直流变换模块具有较低的输入电压，一部分交直流变换模块具有较高的输入电压，从而使得太阳能并网逆变装置整体具有较宽的输入电压范围，这样，即使在光伏阵列的输出电压较低时，太阳能并网逆变装置仍能正常开启，从而可以使太阳能并网逆变装置具备更长的运行时间，进而提升了发电量。In addition, due to the lower input voltage of the AC-DC conversion modules with lower rated power, some AC-DC conversion modules have lower input voltages, and some AC-DC conversion modules have higher input voltages, so that solar grid-connected inverters The overall inverter has a wide input voltage range, so that even when the output voltage of the photovoltaic array is low, the solar grid-connected inverter can still be turned on normally, so that the solar grid-connected inverter can have a longer operating time , thereby increasing the power generation.
附图说明 Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.
图1为太阳能并网逆变装置的功能示意图；Figure 1 is a functional schematic diagram of a solar grid-connected inverter device;
图2为现有的交直流变换模块的转换效率与载荷之间的关系曲线图；FIG. 2 is a graph showing the relationship between conversion efficiency and load of an existing AC-DC conversion module;
图3为本发明实施例提供的太阳能并网逆变装置的转换效率曲线与两种现有的太阳能并网逆变装置的转换效率曲线的对比图；Fig. 3 is a comparison diagram of the conversion efficiency curve of the solar grid-connected inverter device provided by the embodiment of the present invention and the conversion efficiency curves of two existing solar grid-connected inverter devices;
图4为本发明实施例提供的太阳能并网逆变装置的一种物理结构框图；Fig. 4 is a physical structural block diagram of a solar grid-connected inverter device provided by an embodiment of the present invention;
图5为本发明实施例提供的太阳能并网逆变装置的另一种物理结构框图；Fig. 5 is another physical structural block diagram of the solar grid-connected inverter device provided by the embodiment of the present invention;
图6为本发明实施例提供的太阳能并网逆变装置的再一种物理结构框图。Fig. 6 is another physical structure block diagram of the solar grid-connected inverter device provided by the embodiment of the present invention.
具体实施方式 Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
本发明实施例提供一种太阳能并网逆变装置，包括多个交直流变换模块，每个所述交直流变换模块的额定功率之和为所述太阳能并网逆变装置的额定功率，其中，至少两个所述交直流变换模块具有不同的额定功率。An embodiment of the present invention provides a solar grid-connected inverter device, which includes a plurality of AC-DC conversion modules, and the sum of the rated power of each AC-DC conversion module is the rated power of the solar grid-connected inverter device, wherein, At least two of the AC-DC conversion modules have different rated powers.
下面以太阳能并网逆变装置包含4个交直流变换模块为例，详细说明本发明实施例，各模块的额定功率(P1～P4)分别为：P1＝10％*P；P2＝20％*P；P3＝20％*P；P4＝50％*P，其中，P为装置的额定功率。当装置的载荷W分别为5％、10％、20％、30％、50％、75％、100％时，各模块的载荷Lm(m为模块的编号，此例中m≤4)如表2所示，且满足公式W＝L1*C1+L2*C2+…+Lm*Cm，其中，Cm为模块m的额定功率占装置额定功率的百分比。表2中的短横线表示相应的交直流变换模块未开启，当某一模块未开启时，其上述公式中相应的载荷为0。In the following, the solar grid-connected inverter device includes four AC-DC conversion modules as an example to describe the embodiment of the present invention in detail. The rated power (P 1 -P 4 ) of each module is respectively: P 1 =10%*P; P 2 =20%*P; P 3 =20%*P; P 4 =50%*P, where P is the rated power of the device. When the load W of the device is 5%, 10%, 20%, 30%, 50%, 75%, and 100% respectively, the load L m of each module (m is the number of the module, m≤4 in this example) as As shown in Table 2, and satisfy the formula W=L 1 *C 1 +L 2 *C 2 +...+L m *C m , where C m is the percentage of the rated power of module m to the rated power of the device. The short horizontal line in Table 2 indicates that the corresponding AC-DC conversion module is not turned on. When a certain module is not turned on, the corresponding load in the above formula is 0.
表2Table 2
从表2中可以看出，在太阳能并网逆变装置工作于不同的载荷下时，所有处于工作状态的交直流变换模块都能工作在50％或100％，不存在低于50％的情况，因此能显著提高各模块的转换效率，从而提高了太阳能并网逆变装置的转换效率。通过图3能清楚地看出：采用单个交直流变换模块的太阳能并网逆变装置、采用多个具有相同额定功率的交直流变换模块的太阳能并网逆变装置及本发明的太阳能并网逆变装置中的转换效率依次增大。It can be seen from Table 2 that when the solar grid-connected inverter works under different loads, all the AC-DC conversion modules in the working state can work at 50% or 100%, and there is no case of less than 50% , so the conversion efficiency of each module can be significantly improved, thereby improving the conversion efficiency of the solar grid-connected inverter device. It can be clearly seen from Fig. 3 that: the solar grid-connected inverter device adopting a single AC-DC conversion module, the solar grid-connected inverter device adopting multiple AC-DC conversion modules with the same rated power, and the solar grid-connected inverter device of the present invention The conversion efficiency in the converter increases sequentially.
上述的太阳能并网逆变装置中，由于有三个交直流变换模块的额定功率不同，因此必然有至少一个模块的额定功率小于25％*P，使得该些模块在装置的载荷为5％～10％时，单独工作，且该些模块的载荷高于额定功率为25％*P的模块单独工作时的载荷，从而使得具有两个不同额定功率模块的太阳能并网逆变装置的转换效率高于现有的具有两个相同额定功率模块的太阳能并网逆变装置。In the above-mentioned solar grid-connected inverter device, since there are three AC-DC conversion modules with different rated power, there must be at least one module whose rated power is less than 25%*P, so that the load of these modules on the device is 5%-10 %, work alone, and the load of these modules is higher than the load when the modules with rated power of 25%*P work alone, so that the conversion efficiency of the solar grid-connected inverter device with two different rated power modules is higher than Existing solar grid-connected inverters with two identically rated power modules.
另外，由于上述具有不同额定功率模块的太阳能并网逆变装置中有三个模块的额定功率小于25％*P，一个模块的额定功率大于25％*P，并且由于具有较低额定功率的交直流变换模块的输入电压较低，使得该太阳能并网逆变装置的输入电压范围比现有的具有相同额定功率模块的太阳能并网逆变装置的输入电压范围宽，因此，即使在光伏阵列的输出电压较低时，该太阳能并网逆变装置仍能正常开启，从而可以使太阳能并网逆变装置具备更长的运行时间，进而提升了发电量。In addition, since the above-mentioned solar grid-connected inverter devices with different rated power modules have three modules whose rated power is less than 25%*P, and one module whose rated power is greater than 25%*P, and because the AC/DC with lower rated power The input voltage of the conversion module is low, so that the input voltage range of the solar grid-connected inverter device is wider than that of the existing solar grid-connected inverter device with the same rated power module, so even if the output of the photovoltaic array When the voltage is low, the solar grid-connected inverter device can still be turned on normally, so that the solar grid-connected inverter device can have a longer running time, thereby increasing the power generation.
下面再以太阳能并网逆变装置包含2个交直流变换模块为例，详细说明本发明实施例，2个模块的额定功率(P1，P2)分别为：P1＝40％*P；P2＝60％*P，其中，P为装置的额定功率。当装置的载荷W分别为5％、10％、20％、30％、50％、75％、100％时，各模块的载荷Lm(m为模块的编号，此例中m≤2)如表3所示。表3中的短横线表示相应的交直流变换模块未开启。Taking the solar grid-connected inverter device as an example to describe the embodiment of the present invention in detail below, the rated power (P 1 , P 2 ) of the two modules is: P 1 =40%*P; P 2 =60%*P, where P is the rated power of the device. When the load W of the device is 5%, 10%, 20%, 30%, 50%, 75%, and 100% respectively, the load L m of each module (m is the number of the module, m≤2 in this example) as Table 3 shows. The short horizontal line in Table 3 indicates that the corresponding AC-DC conversion module is not turned on.
表3table 3
如果上述太阳能并网逆变装置中的两个交直流变换模块的额定功率相等，即采用现有技术的结构，P1＝50％*P；P2＝50％*P，其中，P为装置的额定功率。则当装置的载荷W分别为5％、10％、20％、30％、50％、75％、100％时，各模块的载荷Lm(m为模块的编号，此例中m≤2)如表4所示。If the rated powers of the two AC-DC conversion modules in the above-mentioned solar grid-connected inverter device are equal, that is, the structure of the prior art is adopted, P 1 =50%*P; P 2 =50%*P, where P is the device rated power. Then when the load W of the device is 5%, 10%, 20%, 30%, 50%, 75%, and 100% respectively, the load L m of each module (m is the number of the module, m≤2 in this example) As shown in Table 4.
表4Table 4
通过比较图3和图4可以看出，采用本发明的太阳能并网逆变装置中由于两个交直流变换模块的额定功率不同，因此必然有一个模块的额定功率小于50％*P，使得该模块在装置的载荷为5％～30％时，单独工作，且该模块的载荷高于额定功率为50％*P的模块单独工作时的载荷，从而使得具有两个不同额定功率模块的太阳能并网逆变装置的转换效率高于现有的具有两个相同额定功率模块的太阳能并网逆变装置。By comparing Figure 3 and Figure 4, it can be seen that in the solar grid-connected inverter device of the present invention, because the rated power of the two AC-DC conversion modules is different, there must be a module whose rated power is less than 50%*P, so that the When the load of the device is 5% to 30%, the module works alone, and the load of the module is higher than the load when the module with the rated power of 50%*P works alone, so that the solar energy with two different rated power modules can be parallel The conversion efficiency of the grid inverter is higher than that of the existing solar grid inverter with two modules of the same rated power.
另外，由于上述具有两个不同额定功率模块的太阳能并网逆变装置中有一个模块的额定功率小于50％*P，另一个模块的额定功率大于50％*P，并且由于具有较低额定功率的交直流变换模块的输入电压较低，使得该太阳能并网逆变装置的输入电压范围比现有的具有两个相同额定功率模块的太阳能并网逆变装置的输入电压范围宽，因此，即使在光伏阵列的输出电压较低时，该太阳能并网逆变装置仍能正常开启，从而可以使太阳能并网逆变装置具备更长的运行时间，进而提升了发电量。In addition, in the above-mentioned solar grid-connected inverter device with two different rated power modules, the rated power of one module is less than 50%*P, and the rated power of the other module is greater than 50%*P, and because of the lower rated power The input voltage of the AC-DC conversion module is low, so that the input voltage range of the solar grid-connected inverter device is wider than that of the existing solar grid-connected inverter device with two modules of the same rated power. Therefore, even When the output voltage of the photovoltaic array is low, the solar grid-connected inverter device can still be turned on normally, so that the solar grid-connected inverter device can have a longer running time, thereby increasing the power generation.
需要说明的是：本发明实施例提供的太阳能并网逆变装置中交直流变换模块的个数并不限于上述例子所描述的4个或者2个，可以根据实际需要进行选择。It should be noted that the number of AC/DC conversion modules in the solar grid-connected inverter device provided by the embodiment of the present invention is not limited to 4 or 2 as described in the above example, and can be selected according to actual needs.
本发明实施例提供的太阳能并网逆变装置可具有如下三种物理结构：The solar grid-connected inverter device provided by the embodiment of the present invention may have the following three physical structures:
第一种、如图4所示，包括多个交直流变换模块(图中交直流变换模块的个数为四个，43～46)、机壳41及位于所述机壳41内的控制芯片42，所述多个交直流变换模块(43～46)位于所述机壳41内，且所述控制芯片42用于控制每个所述多个交直流变换模块的工作状态。The first type, as shown in Figure 4, includes a plurality of AC-DC conversion modules (the number of AC-DC conversion modules in the figure is four, 43-46), a casing 41 and a control chip located in the casing 41 42. The multiple AC-DC conversion modules (43-46) are located in the casing 41, and the control chip 42 is used to control the working state of each of the multiple AC-DC conversion modules.
例如图4中，四个交直流变换模块(43～46)的额定功率与太阳能并网逆变装置额定功率的百分比分别为：A％、B％、C％、D％，且四个百分比中至少有两个互不相同，即确定了各交直流变换模块(43～46)的额定功率。在太阳能并网逆变装置的不同载荷下，控制芯片42分别设置各交直流变换模块(43～46)工作时的载荷，并使它们在设定的载荷下工作。For example, in Figure 4, the percentages of the rated power of the four AC-DC conversion modules (43-46) and the rated power of the solar grid-connected inverter device are: A%, B%, C%, and D%, respectively, and among the four percentages At least two of them are different from each other, that is, the rated power of each AC-DC conversion module (43-46) is determined. Under different loads of the solar grid-connected inverter device, the control chip 42 respectively sets the loads of the AC-DC conversion modules (43-46) when they are working, and makes them work under the set loads.
第二种、如图5所示，包括多个交直流变换模块(图中交直流变换模块的个数为四个，511、521、531、541)多个控制芯片(图中控制芯片的个数为四个，512、522、532、542)，一个所述交直流变换模块及一个所述控制芯片封装在一个机壳内构成一个逆变器(图中共构成四个逆变器51～54)；The second type, as shown in Figure 5, includes a plurality of AC-DC conversion modules (the number of AC-DC conversion modules in the figure is four, 511, 521, 531, 541) a plurality of control chips (the number of control chips in the figure The number is four, 512, 522, 532, 542), one said AC-DC conversion module and one said control chip are packaged in a casing to form an inverter (a total of four inverters 51-54 are formed in the figure );
所述控制芯片(512、522、532、542)用于控制其所属的所述逆变器(51～54)中的所述交直流变换模块(511、521、531、541)的工作状态，并用于与其它所述逆变器中的控制芯片通信。The control chips (512, 522, 532, 542) are used to control the working states of the AC-DC conversion modules (511, 521, 531, 541) in the inverters (51-54) to which they belong, And it is used for communicating with the control chips in other said inverters.
例如图5中，四个交直流变换模块(511、521、531、541)的额定功率与太阳能并网逆变装置额定功率的百分比分别为：A％、B％、C％、D％，且四个百分比中至少有两个互不相同，即确定了各交直流变换模块(511、521、531、541)的额定功率。在太阳能并网逆变装置的不同载荷下，各控制芯片(512、522、532、542)分别对其所属的逆变器中的交直流变换模块工作时的载荷进行设置，并使它们在设定的载荷下工作。各控制芯片(512、522、532、542)相互连接，以便于各控制芯片(512、522、532、542)间相互通信，且相互通信的目的是为了各交直流变换模块(511、521、531、541)的能按照最优的载荷协同工作。For example, in Figure 5, the percentages of the rated power of the four AC-DC conversion modules (511, 521, 531, 541) and the rated power of the solar grid-connected inverter device are: A%, B%, C%, and D%, respectively, and At least two of the four percentages are different from each other, that is, the rated power of each AC-DC conversion module (511, 521, 531, 541) is determined. Under different loads of the solar grid-connected inverter device, each control chip (512, 522, 532, 542) sets the load of the AC-DC conversion module in the inverter to which it belongs, and makes them work under a given load. The control chips (512, 522, 532, 542) are connected to each other so that the control chips (512, 522, 532, 542) communicate with each other, and the purpose of the mutual communication is for each AC-DC conversion module (511, 521, 531, 541) can work together according to the optimal load.
第三种、如图6所示，与图5所示的结构不同之处在于，省去了各逆变器中的控制芯片，使得一个所述交直流变换模块封装在一个机壳内构成一个逆变器，并在逆变器外部增设了控制器65，所述控制器65用于控制每个所述逆变器(图中逆变器的个数为四个，61～64)中所述交直流变换模块的工作状态。The third type, as shown in Figure 6, is different from the structure shown in Figure 5 in that the control chips in each inverter are omitted, so that one of the AC-DC conversion modules is packaged in a casing to form a inverter, and a controller 65 is added outside the inverter, and the controller 65 is used to control all of the inverters (the number of inverters in the figure is four, 61-64). Describe the working status of the AC-DC conversion module.
例如图6中，四个逆变器(61～64)中的交直流变换模块(611、621、631、641)的额定功率与太阳能并网逆变装置额定功率的百分比分别为：A％、B％、C％、D％，且四个百分比中至少有两个互不相同，即确定了各交直流变换模块(611、621、631、641)的额定功率。在太阳能并网逆变装置的不同载荷下，控制器65分别设置各交直流变换模块(611、621、631、641)工作时的载荷，并使它们在设定的载荷下工作。For example, in Figure 6, the percentages of the rated power of the AC-DC conversion modules (611, 621, 631, 641) in the four inverters (61-64) and the rated power of the solar grid-connected inverter device are: A%, B%, C%, D%, and at least two of the four percentages are different from each other, that is, the rated power of each AC-DC conversion module (611, 621, 631, 641) is determined. Under different loads of the solar grid-connected inverter device, the controller 65 respectively sets the loads of the AC-DC conversion modules (611, 621, 631, 641) when they are working, and makes them work under the set loads.
相比于图5所示的结构，图6所示的结构中，各逆变器可配置在不同的地点，且各地点之间的距离可以比较远，逆变器的配置地点也可以离控制器的配置地点较远，以实现对各逆变器的远程控制。Compared with the structure shown in Figure 5, in the structure shown in Figure 6, each inverter can be configured in different locations, and the distance between each location can be relatively far, and the configuration location of the inverter can also be far away from the control The configuration location of the inverter is relatively far to realize the remote control of each inverter.
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.
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